X-Git-Url: http://challenge-bot.com/repos/?p=challenge-bot;a=blobdiff_plain;f=wheel.scad;h=131caf8d5af204b1f7fc47d891bddedb5054fe61;hp=c361773198b866ae8b6b2bd8ad7385a0d2c5e2f1;hb=ac757602dfe7948c40c38a501386d13a93db7dd6;hpb=0d781ab99535e94ff2784a8bef7c30ad233c665b

diff --git a/wheel.scad b/wheel.scad
index c361773..131caf8 100644
--- a/wheel.scad
+++ b/wheel.scad
@@ -4,37 +4,48 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
-wheel_depth = 7.65;
+wheel_depth = 6;
 wheel_radius = 68/2;
 
 module encoder_shaft(){
-  motor_shaft_big = 3.7;
-  motor_shaft_small = 4.8;
-  motor_shaft_length = wheel_depth / 2;
+  // measured with calipers, checked against the motor shaft
+  motor_shaft_big = 3.7; // radius, gets doubled in cylinder
+  motor_shaft_small = 4.8; // total length of box
+  motor_shaft_length = wheel_depth * 3 / 4;
 
   intersection(){
     cylinder(h = motor_shaft_length,
              r = motor_shaft_big,
              center = true,
-             $fn=100);
+             $fn = 30);
+    // x direction is multiplied by 2 because the radius of the cylinder
+    // goes in both directions.  the extra .1 is for overlap
     cube([motor_shaft_big * 2.1, motor_shaft_small, motor_shaft_length],
          center = true);}}
 
 module mounting_screw(){
-  cylinder(h = wheel_depth * 1.1, r = 1, $fn = 100, center = true);}
+  cylinder(h = wheel_depth * 1.1, r = 1, $fn = 30, center = true);}
 
 module wheel(){
   translate([0, 0, wheel_depth / 2]){
     difference(){
-      cylinder(h = wheel_depth, r = wheel_radius, center = true, $fn=100);
-      translate([0, 0, wheel_depth/4]){
+      cylinder(h = wheel_depth, r = wheel_radius, center = true, $fn = 30);
+      translate([0, 0, wheel_depth / 4]){
         scale([1, 1, 1.1]){
           encoder_shaft();}}
       mounting_screw();
-      for(i = [0 : 4]){
+      for(i = [1 : 5]){
         rotate(i * 360/5, [0, 0, 1]){
           translate([0, 0, -0.6 * wheel_depth])
-            between_spokes();}}}}}
+            between_spokes();}}
+      translate([0, 0, wheel_depth / 4]){
+        difference(){
+          cylinder(h = wheel_depth / 1.2,
+                   r = 0.85 * wheel_radius,
+                   center = true);
+          cylinder(h = wheel_depth / 1.2,
+                   r = 0.23 * wheel_radius,
+                   center = true);}}}}}
 
 module wheel_block(){
   cube([wheel_radius, wheel_radius, wheel_depth]);}
@@ -43,18 +54,18 @@ module pie_slice(){
   intersection(){
     translate([0, 0, wheel_depth / 2]){
       cylinder(h = wheel_depth,
-               r = 0.7 * wheel_radius,
+               r = 0.85 * wheel_radius,
                center = true);}
     translate([0, wheel_radius * 0.3, 0]){
-      rotate([0, 0, (360/5)/2]){
+      rotate([0, 0, (360 / 5) / 2]){
         intersection(){
           wheel_block();
-          rotate([0, 0, 90 - 360/5])
+          rotate([0, 0, 90 - 360 / 5])
             wheel_block();}}}}}
 
 module between_spokes(){
   minkowski(){
     pie_slice();
-    cylinder(h = wheel_depth, r = 1, $fn=100);}}
+    cylinder(h = wheel_depth / 2, r = 1, $fn = 30);}}
 
 wheel();